Study on coating technic to enhance accident tolerance of fuel cladding, 3; Metallographic evaluation of Cr-coated cladding after oxidation test in high temperature steam

Kawai, Keito*; Fujimura, Yuki; Kondo, Keietsu  ; Abe, Yosuke  ; Ishikawa, Norito   ; Nemoto, Yoshiyuki  ; Yamashita, Shinichiro   ; Ishijima, Yasuhiro ; Ioka, Ikuo  ; Funamoto, Kodai*; Atsumi, Hisao*

In the previous report, we reported on the differences in oxidation and hydrogen absorption behavior of Zircaloy-4 cladding specimen and specimen with chromium (Cr) coating on its outer surfaces when they were subjected to oxidation tests in high temperature steam at 1100C for 20 minutes. In this report, we describe the details of the cross-sectional observation of these specimens and the results of the evaluation of the differences in the shape and distribution of hydrides and other substances depending on the presence or absence of Cr coating.